NO168699B - PROCEDURES FOR THE PREPARATION OF SODIUM DITIONITE PREPARATION FOR USE OF MIXTURES AND APPLICATION OF SUCH MIXTURES. - Google Patents
PROCEDURES FOR THE PREPARATION OF SODIUM DITIONITE PREPARATION FOR USE OF MIXTURES AND APPLICATION OF SUCH MIXTURES. Download PDFInfo
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- NO168699B NO168699B NO861801A NO861801A NO168699B NO 168699 B NO168699 B NO 168699B NO 861801 A NO861801 A NO 861801A NO 861801 A NO861801 A NO 861801A NO 168699 B NO168699 B NO 168699B
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- sulphur dioxide
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- 239000000203 mixture Substances 0.000 title claims abstract description 25
- 238000000034 method Methods 0.000 title claims description 12
- 239000011734 sodium Substances 0.000 title claims description 5
- 238000002360 preparation method Methods 0.000 title description 3
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 title 1
- 229910052708 sodium Inorganic materials 0.000 title 1
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims abstract description 31
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 28
- KKCBUQHMOMHUOY-UHFFFAOYSA-N sodium oxide Chemical compound [O-2].[Na+].[Na+] KKCBUQHMOMHUOY-UHFFFAOYSA-N 0.000 claims abstract description 19
- 238000004519 manufacturing process Methods 0.000 claims abstract description 17
- 239000007788 liquid Substances 0.000 claims abstract description 15
- JVBXVOWTABLYPX-UHFFFAOYSA-L sodium dithionite Chemical compound [Na+].[Na+].[O-]S(=O)S([O-])=O JVBXVOWTABLYPX-UHFFFAOYSA-L 0.000 claims abstract description 9
- GRWZHXKQBITJKP-UHFFFAOYSA-L dithionite(2-) Chemical compound [O-]S(=O)S([O-])=O GRWZHXKQBITJKP-UHFFFAOYSA-L 0.000 claims abstract description 8
- 230000003134 recirculating effect Effects 0.000 claims abstract description 7
- 239000000243 solution Substances 0.000 claims description 30
- 239000003638 chemical reducing agent Substances 0.000 claims description 8
- 238000010790 dilution Methods 0.000 claims description 6
- 239000012895 dilution Substances 0.000 claims description 6
- 238000011144 upstream manufacturing Methods 0.000 claims description 3
- 238000002156 mixing Methods 0.000 claims description 2
- 230000003189 isokinetic effect Effects 0.000 claims 1
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 abstract 16
- 235000010269 sulphur dioxide Nutrition 0.000 abstract 8
- 239000004291 sulphur dioxide Substances 0.000 abstract 8
- 229910001948 sodium oxide Inorganic materials 0.000 abstract 3
- 239000007864 aqueous solution Substances 0.000 abstract 1
- 239000011369 resultant mixture Substances 0.000 abstract 1
- 235000011121 sodium hydroxide Nutrition 0.000 description 7
- WQDSRJBTLILEEK-UHFFFAOYSA-N sulfurous acid Chemical compound OS(O)=O.OS(O)=O WQDSRJBTLILEEK-UHFFFAOYSA-N 0.000 description 7
- 239000007789 gas Substances 0.000 description 6
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 4
- 239000003546 flue gas Substances 0.000 description 4
- 238000003860 storage Methods 0.000 description 4
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 3
- 239000012279 sodium borohydride Substances 0.000 description 3
- 229910000033 sodium borohydride Inorganic materials 0.000 description 3
- VYKVQJFOZDGJLN-UHFFFAOYSA-M sodium hydrogen sulfite sulfurous acid Chemical compound [Na+].OS(O)=O.OS([O-])=O VYKVQJFOZDGJLN-UHFFFAOYSA-M 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- LSNNMFCWUKXFEE-UHFFFAOYSA-M Bisulfite Chemical compound OS([O-])=O LSNNMFCWUKXFEE-UHFFFAOYSA-M 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- LSNNMFCWUKXFEE-UHFFFAOYSA-N Sulfurous acid Chemical compound OS(O)=O LSNNMFCWUKXFEE-UHFFFAOYSA-N 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 239000000356 contaminant Substances 0.000 description 1
- 238000010924 continuous production Methods 0.000 description 1
- 238000007865 diluting Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 125000004435 hydrogen atom Chemical class [H]* 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B17/00—Sulfur; Compounds thereof
- C01B17/64—Thiosulfates; Dithionites; Polythionates
- C01B17/66—Dithionites or hydrosulfites (S2O42-)
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01D—COMPOUNDS OF ALKALI METALS, i.e. LITHIUM, SODIUM, POTASSIUM, RUBIDIUM, CAESIUM, OR FRANCIUM
- C01D5/00—Sulfates or sulfites of sodium, potassium or alkali metals in general
- C01D5/14—Preparation of sulfites
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Treating Waste Gases (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
- Inorganic Compounds Of Heavy Metals (AREA)
- Solid Fuels And Fuel-Associated Substances (AREA)
- Extraction Or Liquid Replacement (AREA)
- Saccharide Compounds (AREA)
Abstract
Description
Foreliggende oppfinnelse angår en fremgangsmåte ved fremstilling av for natriumditionittfremstilling anvendbare blandinger og anvendelsen av slike blandinger. The present invention relates to a method for the production of mixtures usable for sodium dithionite production and the use of such mixtures.
I henhold til en kjent fremgangsmåte for fremstilling av natriumditionitt blandes 45-50 vekt-#-ig natronlut, flytende SO2 og vann med en reduksjonsmiddelblanding bestående av 12 vekt-# natriumborhydrid, 40 vekt-56 natriumhydroksyd og 48 vekt-# vann i et rørsystem hvor blandingen sirkuleres for å avlede den dannede kraftige reaksjonsvarmen. På grunn av antallet komponenter som blandes, kreves et flertall reguleringer. Dessuten er håndteringen av flytende SO2 besværlig. According to a known method for the production of sodium dithionite, 45-50 wt-#-ig caustic soda, liquid SO2 and water are mixed with a reducing agent mixture consisting of 12 wt-# sodium borohydride, 40 wt-# 56 sodium hydroxide and 48 wt-# water in a piping system where the mixture is circulated to dissipate the powerful heat of reaction formed. Due to the number of components being mixed, multiple controls are required. Furthermore, the handling of liquid SO2 is difficult.
Et formål med oppfinnelsen er derfor å tilveiebringe en fremgangsmåte til å fremstille blandinger som er anvendbare for natrlumditionittfrerostilling, og som letter arbeidet for ditionittfremstilleren ved å redusere antall komponenter som må håndteres og derved også antall reguleringer, og som reduserer behovet for avkjøling. An object of the invention is therefore to provide a method for producing mixtures which are applicable for sodium dithionite production, and which facilitates the work of the dithionite producer by reducing the number of components that must be handled and thereby also the number of adjustments, and which reduces the need for cooling.
Dette oppnås ifølge foreliggende oppfinnelse ved en fremgangsmåte ved fremstilling av for natriumditionittfremstilling anvendbare blandinger der SO2 bringes i kontakt med en resirkulerende vannoppløsning av NaOH og tidligere absorbert SO2 til et forhold mellom S02 og summen av SO2 og Na20 på 0,61 til 0,66, hvorefter den således oppnådde blanding settes under trykk og flytende SO2 innføres, idet fremgangsmåten karakteriseres ved at flytende SO2 og fortynningsvann tilføres blandingen i et oppstrøms av en resirkuleringspumpe og nedstrøms av en innsnevring avgrenset og under trykk stående parti av en resirkuleringssløyfe til et forhold mellom SO2 og summen av SO2 og Na20 på 0,75 til 0,81 og en konsentrasjon av SO2 + Na20 på 10 til 13 vekt-#. This is achieved according to the present invention by a method for the production of mixtures usable for sodium dithionite production where SO2 is brought into contact with a recirculating water solution of NaOH and previously absorbed SO2 to a ratio between SO2 and the sum of SO2 and Na2O of 0.61 to 0.66, after which the mixture thus obtained is pressurized and liquid SO2 is introduced, the method being characterized by liquid SO2 and dilution water being added to the mixture in an upstream of a recirculation pump and downstream of a constriction bounded and pressurized part of a recirculation loop to a ratio between SO2 and the sum of SO 2 and Na 2 O of 0.75 to 0.81 and a concentration of SO 2 + Na 2 O of 10 to 13 wt-#.
Ved det første delmoment i fremgangsmåten ifølge oppfinnelsen der SO2 bringes i kontakt med en resirkulerende vannoppløs-ning av NaOH og tidligere absorbert S02, tilføres SO2 fortrinnsvis i form av en fortrinnsvis tørr S02~holdig røkgass som oppnås ved fremstilling av svovelsyre. Røkgasser fra anlegg som forbrenner svovelholdig brensel, kan også anvendes, og forholdsregler taes for å hindre utkondensering av vann ved gassens behandling med den resirkulerene vannoppløsning av NaOH og SO2. Den S02-holdige gassen bringes fortrinnsvis i kontakt med den resirkulerende vannoppløsning i et vanlig skrubberanlegg. In the first part of the method according to the invention where SO2 is brought into contact with a recirculating water solution of NaOH and previously absorbed SO2, SO2 is preferably supplied in the form of a preferably dry SO2-containing flue gas which is obtained from the production of sulfuric acid. Flue gases from plants that burn sulfur-containing fuel can also be used, and precautions are taken to prevent the condensation of water when the gas is treated with the recycled water solution of NaOH and SO2. The SO2-containing gas is preferably brought into contact with the recirculating water solution in a conventional scrubber plant.
Dette delmoment utføres fortrinnsvis ved omtrent atmosfærestrykk som en kontinuerlig fremgangsmåte idet en del av oppløsningen unndras fra sirkulasjonen og erstattes med en vannoppløsning av NaOH, men kan også utføres porsjonsvis. Ved begge alternativer styres fremgangsmåten således av den oppnådde blandingen har et forhold SO2:(S02+Na20) på 0,61-0,66, fortrinnsvis 0,63-0,65. This part is preferably carried out at approximately atmospheric pressure as a continuous process, with a part of the solution withdrawn from the circulation and replaced with a water solution of NaOH, but can also be carried out in portions. In both alternatives, the method is thus controlled by the obtained mixture having a ratio SO2:(SO2+Na2O) of 0.61-0.66, preferably 0.63-0.65.
For det andre deltrinn overføres i det første deltrinn oppnådd blanding til et rom som står under trykk, for eksempel av størrelsesorden 2,5 bar eller mere, fortrinnsvis i form av et oppstrøms en resirkuleringspumpe og nedstrøms et strypningsavgrenset parti av en resirkulasjonsslynge, i hvilke som flytende SO2 innføres i blandingen til et forhold S02:(S02+Na20) på 0,75-0,81, fortrinnsvis ca. 12 vekt-*, således at det fremkommer et produkt i form av en oppløsning som kan lagres ved atmosfærestrykk. In the second sub-stage, the mixture obtained in the first sub-stage is transferred to a room that is under pressure, for example of the order of 2.5 bar or more, preferably in the form of an upstream recirculation pump and downstream a throttle-limited part of a recirculation loop, in which liquid SO2 is introduced into the mixture to a ratio S02:(S02+Na2O) of 0.75-0.81, preferably approx. 12 weight-*, so that a product is produced in the form of a solution that can be stored at atmospheric pressure.
Oppfinnelsen vedrører også anvendelsen av en i henhold til fremgangsmåten ifølge oppfinnelsen fremstilt blanding for ditionittfremstilling ved reduksjon. Ved anvendelse blandes den med en reduksjonsmiddelblanding av fortrinnsvis ovenfor angitt vanlig type, og resirkuleres eventuelt i et rørsystem, eventuelt med innblanding av vann for fortynning. Hvis ønsket kan fortynningen med vann også skje før sirkulasjonen i steden for under denne, eller også kan fortynningen skje av det oppnådde produkt. The invention also relates to the use of a mixture prepared according to the method according to the invention for the production of dithionite by reduction. When used, it is mixed with a reducing agent mixture of preferably the common type indicated above, and optionally recycled in a pipe system, optionally with the mixing of water for dilution. If desired, the dilution with water can also take place before the circulation instead of during this, or the dilution can also take place of the product obtained.
Oppfinnelsen skal forklares nærmere ved hjelp av det på vedlagte tegning skjematisk viste anlegg for natriumditio-nittf remstilling i henhold til oppfinnelsen. The invention shall be explained in more detail with the help of the plant shown schematically in the attached drawing for sodium dithionite production in accordance with the invention.
På tegningen er det med 1 og 2 betegnet en -tankbil hen-holdsvis en slepetank. Tanken av tankbilen 1 er beregnet til å inneholde flytende SO2 og slepetanken en natriumsulfitt-bisulfitt-oppløsning med et forhold S02:(S02+Na20) i størrelsesorden 0,61-0,65 og en konsentrasjon i for eksempel størrelsesorden 40 vekt-*. Sumkonsentrasjonen av S02 + Na20 i det sammenlagte tankinnholdet i tankbilen 1 og slepetanken 2, er hensiktsmessig ca. 50 vekt-*. In the drawing, 1 and 2 denote a tank truck and a tow tank, respectively. The tank of tanker 1 is intended to contain liquid SO2 and the tow tank a sodium sulphite-bisulphite solution with a ratio S02:(S02+Na20) of the order of 0.61-0.65 and a concentration of, for example, of the order of 40 weight-*. The total concentration of S02 + Na20 in the combined tank contents in tanker 1 and tow tank 2 is suitably approx. 50 weight-*.
Med 3 er det betegnet en tank hvori det hersker omtrent atmosfæretrykk og som inngår i et resirkulasjonssystem innbefattende en sirkulasjonspumpe 4, en mellom tanken 3, og sugesiden av pumpen 4 gående ledning 5, og en mellom trykksiden av pumpen 4, og tanken 3 gående ledning 6 med en avstengningsventil 7, en strupning 8, og et ledningsparti 9, som har en utvidet tverrsnittsareal. Ved hjelp av en pumpe 10, inneholdende ledning 11, er tanken av tankbilen tilsluttbar til ledningspartiet 10, og ved hjelp av en pumpe 12, inneholdende en ledning 13, er slepetanken 2 tilsluttbar til ledningen 5. Ved 14 er det antydet en vanntilførselsledning som grener seg for dannelse av tre ledninger 15, 16, 17 hvorav den ene 15 tilfører vann til ledningen 5 for fortynning av gjennom ledningen 13 ankomne sulfitt-bisulfitt-oppløsning. Strømmene gjennom tilløpsledningen 11, 13, 15 og i resirkulasjonssystemet 3-9, avpasses ved hjelp av ikke viste reguleringsorgan og ved innstilling av strupningen 8 således, at et trykk av for eksempel størrelsesorden 2,5 bar opprettholdes til ledningspartiet 10 under tømming av tankbilen og slepetanken 2. Herved unngås på heldig måte behovet for vanlige dyre trykkbeholdere. Med de hittil omtalte arrangement, fremstilles og tilføres tanken 3 ved natriumsulfitt-bisulfittoppløsning et forhold S02:(S02+Na20) på 0,75-0,81, og en slik konsentrasjon (10-13 vekt-*) at den kan oppbevares ved atmosfæretrykk. 3 denotes a tank in which approximately atmospheric pressure prevails and which forms part of a recirculation system including a circulation pump 4, a line 5 running between the tank 3 and the suction side of the pump 4, and a line running between the pressure side of the pump 4 and the tank 3 6 with a shut-off valve 7, a throttle 8, and a line portion 9, which has an extended cross-sectional area. With the help of a pump 10, containing line 11, the tank of the tanker can be connected to the line part 10, and with the help of a pump 12, containing a line 13, the tow tank 2 can be connected to the line 5. At 14, a water supply line that branches is indicated itself for the formation of three lines 15, 16, 17, one of which 15 supplies water to the line 5 for diluting the sulphite-bisulphite solution arriving through the line 13. The flows through the supply line 11, 13, 15 and in the recirculation system 3-9 are adjusted by means of a regulating device not shown and by setting the throttle 8 so that a pressure of, for example, the order of magnitude 2.5 bar is maintained to the line section 10 during emptying of the tanker and the towing tank 2. This fortunately avoids the need for ordinary expensive pressure vessels. With the arrangements mentioned so far, tank 3 is prepared and supplied with sodium sulphite-bisulphite solution to a ratio S02:(S02+Na20) of 0.75-0.81, and such a concentration (10-13 weight-*) that it can be stored at atmospheric pressure.
Trykkslden av pumpen 4 er ved hjelp av en med avstegnlngs-ventll 18 utstyrt ledning 19, tilsluttbar til en lagringstank 20, hvor.det likeledes hersker vesentlige atmosfæretrykk. Fra overdelen av tanken 20 avgående gass, avledes efter vasking i en skrubber 21 eller lignende, med gjennom ledning 17 tilført vann. Dette vann med deri oppløst SO2 tilføres tanken 3 via en ledning 22. I overdelen av tanken 3 samlet gass sprayes med gjennom ledning 16 tilført vann mens ikke oppløste gasser tilføres overdelen av tanken 20 gjennom en gassledning 23. The pressure source of the pump 4 is, by means of a line 19 equipped with a shut-off valve 18, connectable to a storage tank 20, where substantial atmospheric pressure also prevails. The gas leaving the upper part of the tank 20 is diverted after washing in a scrubber 21 or similar, with water supplied through line 17. This water with dissolved SO2 is supplied to the tank 3 via a line 22. Gas collected in the upper part of the tank 3 is sprayed with water supplied through line 16, while undissolved gases are supplied to the upper part of the tank 20 through a gas line 23.
For fremstilling av natriumditionitt sammenføres oppløsningen fra tanken 20 med et vanlig reduksjonsmiddel, i det vesentlige bestående av en vannoppløsning av natriumborhydrid og natriumhydroksyd. Dette foregår i en resirkuleringskrets, og omfatter en sirkulasjonspumpe 24, et kar 25, og mellom bunnen av karet 25 og sugesiden av pumpen 24 gående ledning 26, samt en mellom trykkslden av pumpen 24 og karet 25 gående ledning 27 hvori det er anordnet en varmeveksler 28, for avkjøling av den sirkulerende væske til ønsket temperaturnivå. Natrium-sulf itt-bisulf itt-oppløsningen tilføres ledningen 27 via en med pumpe 29 utstyrt ledning 30, mens reduksjonsmiddeloppløs-ningen tilføres ledningen 27 fra en lagringstank 31, via en med pumpe 32 utstyrt ledning 33. Ferdig natriumditionitt-oppløsning avgår gjennom et i karet 25 anordnet breddavløp 34 og tilføres en. lagringstank 35 gjennom en ledning 36, eventuelt efter fortynning med gjennom en ledning 37 innkomne vann. Fra tanken 35 avgår ferdig ditionitt-oppløsning til forbrukerstedet gjennom en med pumpe 38 utstyrt ledning 39. For the production of sodium dithionite, the solution from the tank 20 is combined with a common reducing agent, essentially consisting of a water solution of sodium borohydride and sodium hydroxide. This takes place in a recirculation circuit, and comprises a circulation pump 24, a vessel 25, and line 26 running between the bottom of the vessel 25 and the suction side of the pump 24, as well as a line 27 running between the pressure side of the pump 24 and the vessel 25, in which a heat exchanger is arranged 28, for cooling the circulating liquid to the desired temperature level. The sodium-sulphite-bisulphite solution is supplied to the line 27 via a line 30 equipped with a pump 29, while the reducing agent solution is supplied to the line 27 from a storage tank 31, via a line 33 equipped with a pump 32. Finished sodium dithionite solution leaves through a the tub 25 is equipped with a bank drain 34 and is supplied with a storage tank 35 through a line 36, possibly after dilution with water entering through a line 37. From the tank 35, the finished dithionite solution departs to the consumer site through a line 39 equipped with a pump 38.
For å unngå utbyttetap på grunn av hydrogendannelse i resirkuleringskretsen 24-28, hardet vist seg meget hensiktsmessig å tilsette reduksjonsmiddeloppløsningen og med fordel også sulfitt-bisulfitt-oppløsningen vesentlig isokinetisk til den i krav 24-28 sirkulerende væske, det vil si de tilførte oppløsningen innføres i ledning 27 i en retning og med en strømningshastighet som vesentlig stemmer overens med strømningsretning og -hastighet hos den resirku-lerte oppløsningen. For dette formål munner det inn led-ningene 30 og 33 i ledning 27, slik som det fremgår av det i aksialsektoren viste partiet 40 av denne ledning 27, gjennom nedstrømsrettede munnstykket 41, idet hver gren er utstyrt med munnstykket 41, og innstillbar ventil 42. Den gjennom ledningen 36 fra sirkulasjonssystemet 24-28 avgående oppløsning, kan tilsettes for eksempel kompleksdannere for separering av ikke ønskede metallforurensninger og pH-regulerende tilsetninger. In order to avoid loss of yield due to hydrogen formation in the recycling circuit 24-28, it has proven very appropriate to add the reducing agent solution and with advantage also the sulphite-bisulphite solution substantially isokinetically to the liquid circulating in claims 24-28, that is to say the added solution is introduced in line 27 in a direction and with a flow rate which substantially corresponds to the flow direction and rate of the recirculated solution. For this purpose, the lines 30 and 33 open into line 27, as can be seen from the part 40 of this line 27 shown in the axial sector, through the downstream nozzle 41, each branch being equipped with the nozzle 41 and adjustable valve 42 The solution leaving through line 36 from the circulation system 24-28 can be added, for example, to complex formers for separating unwanted metal contaminants and pH-regulating additives.
Eksempel 1 Example 1
Sulfitt-bisulfitt-oppløsning fraen røkgass-skrubber for SO2-holdig røkgass fra en svovelsyrefabrikk med (sulfitt+bisulf itt )-konsentrasjoner som * (Na20+SC>2) = 39 * og forholdet SO2: (SC>2+Na20) = 0,63-0,65, anvendes sammen med flytende SO2 og vann for fremstilling av en for ditionitt-fremstillingen egnet blanding. Sulfite-bisulfite solution from a flue gas scrubber for SO2-containing flue gas from a sulfuric acid factory with (sulfite+bisulfite) concentrations such as * (Na20+SC>2) = 39 * and the ratio SO2: (SC>2+Na20) = 0.63-0.65, is used together with liquid SO2 and water to produce a mixture suitable for dithionite production.
Herved tilsettes i et under trykk stående kar 4680 mg flytende S02 til 20 000 kg 39 * sulf itt-bisulf itt-oppløsning med SO2:(S02+Na20) = 0,64 og 79 320 kg vann, som ga S02:(S02+Na20) = 0,775 og konsentrasjonen 12 *. In this way, 4680 mg of liquid S02 is added to 20,000 kg of 39 * sulphite-bisulphite solution with SO2:(S02+Na20) = 0.64 and 79,320 kg of water, which gave S02:(S02+ Na2O) = 0.775 and the concentration 12 *.
Oppløsningen ble tilført en lagringstank, hvori det ble opprettholdt atmosfærestrykk og derefter anvendt direkte for ditionittfremstilling idet kun reduksjonsmiddelblanding, for eksempel det av Ventron Corp. Mass. USA, under betegnelsen "Borol" leverte reduksjonsmidler inneholdende omtrent 12 vekt-* NaBH4, 40 vekt-* NaOH og 48 vekt-* H20, måtte tilsettes. Utgående ditionitt-oppløsning ble fortynnet med vann, konsentrasjonen er 3 *. The solution was fed to a storage tank, in which atmospheric pressure was maintained, and then used directly for dithionite preparation, using only a reducing agent mixture, such as that of Ventron Corp. Mass. The USA, under the designation "Borol" supplied reducing agents containing about 12 wt-* NaBH4, 40 wt-* NaOH and 48 wt-* H20, had to be added. Starting dithionite solution was diluted with water, the concentration is 3*.
Eksempel 2 Example 2
Eksempel 1 ble gjentatt men sulfitt-bisulfitt-oppløsningens SO2:(S02+Na20)-forhold var 0,65, og denne gang ble det tilsatt 4333 kg flytende S02 og 76 775 kg vann, således at det også denne gang fremkom faktor 0,775. Example 1 was repeated, but the sulphite-bisulphite solution's SO2:(S02+Na20) ratio was 0.65, and this time 4,333 kg of liquid SO2 and 76,775 kg of water were added, so that a factor of 0.775 also appeared this time.
Eksempel 3 Example 3
Eksempel 1 ble gjentatt, idet det ble anvendt samme sulfitt-bisulf itt-oppløsning som i eksempel 1, men ønskemålet denne gang var et produkt med S02:(S02+Na20) = 0,790. Til de 20 000 kg sulfitt-bisulfitt-oppløsning ble det derfor denne gang satt 5741 kg flytende S02 og 85 684 kg vann. Example 1 was repeated, using the same sulphite-bisulphite solution as in example 1, but the target this time was a product with SO 2 :(SO 2 +Na 2 O) = 0.790. To the 20,000 kg of sulphite-bisulphite solution, 5,741 kg of liquid SO 2 and 85,684 kg of water were therefore added this time.
Claims (5)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US06/731,296 US4680136A (en) | 1985-05-07 | 1985-05-07 | Method for preparing compositions which can be used in the production of sodium dithionite; and the use of such compositions |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| NO861801L NO861801L (en) | 1986-11-10 |
| NO168699B true NO168699B (en) | 1991-12-16 |
| NO168699C NO168699C (en) | 1992-03-25 |
Family
ID=24938913
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| NO861801A NO168699C (en) | 1985-05-07 | 1986-05-06 | PROCEDURES FOR THE PREPARATION OF SODIUM DITIONITE PREPARATION FOR USE OF MIXTURES AND APPLICATION OF SUCH MIXTURES. |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US4680136A (en) |
| EP (1) | EP0202210B1 (en) |
| AT (1) | ATE50750T1 (en) |
| DE (1) | DE3669302D1 (en) |
| FI (1) | FI79826C (en) |
| NO (1) | NO168699C (en) |
Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| IN172015B (en) * | 1986-01-03 | 1993-03-13 | Thiokol Morton Inc | |
| US4859447A (en) * | 1986-12-22 | 1989-08-22 | Morton Thiokol, Inc. | Process for the production of sodium hydrosulfite |
| US4788041A (en) * | 1986-12-22 | 1988-11-29 | Morton Thiokol, Inc. | Apparatus for the production of sodium hydrosulfite |
| US5094833A (en) * | 1989-01-05 | 1992-03-10 | Morton International, Inc. | High yield sodium hydrosulfite generation |
| US5336479A (en) * | 1989-01-05 | 1994-08-09 | Morton International, Inc. | High yield sodium hydrosulfite generation |
| CA1340248C (en) * | 1989-01-05 | 1998-12-15 | Morton International, Inc. | High yield sodium hydrosulfite generation |
| US5516501A (en) * | 1992-05-05 | 1996-05-14 | International Dioxcide | Process for the preparation of aqueous solutions of bromine based disinfectants |
| EP1478593A4 (en) * | 2001-11-13 | 2008-07-02 | Montgomery Chemicals Llc | Aqueous borohydride compositions |
| FI20030928A (en) * | 2003-06-19 | 2004-12-20 | Kvaerner Power Oy | Process for manufacturing sodium dithionite used in bleaching mechanical pulp |
| CA2984117C (en) * | 2015-04-29 | 2023-12-19 | Basf Se | Stabilization of sodium dithionite by means of various additives |
Family Cites Families (21)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA598761A (en) * | 1960-05-24 | Avesta Jernverks Aktiebolag | Methods and apparatus for the preparation of bisulfite solutions | |
| US719720A (en) * | 1899-12-20 | 1903-02-03 | Basf Ag | Hydrosulfite for reducing indigo. |
| GB469724A (en) * | 1936-03-03 | 1937-07-30 | Gustaf Haglund | Plant and process for the production of bisulphite solutions |
| US2991152A (en) * | 1957-01-16 | 1961-07-04 | Goerrig | Method of preparing sodium and potassium hyposulphite |
| US3226185A (en) * | 1961-11-09 | 1965-12-28 | Ethyl Corp | Method of preparing an alkali metal dithionite |
| US3216790A (en) * | 1962-03-22 | 1965-11-09 | Nat Distillers Chem Corp | Preparation of sodium hydrosulfite |
| US3477815A (en) * | 1966-11-15 | 1969-11-11 | Wellman Lord Inc | Process for recovering sulfur dioxide from flue gas |
| JPS4814316B1 (en) * | 1969-01-10 | 1973-05-07 | ||
| US3542511A (en) * | 1969-01-27 | 1970-11-24 | Chemical Construction Corp | Removal of sulfur dioxide from waste gases |
| US3917807A (en) * | 1969-10-30 | 1975-11-04 | Sumitomo Chemical Co | Method for producing anhydrous sodium dithionite |
| US3826812A (en) * | 1971-10-22 | 1974-07-30 | Basic Inc | Treatment of flue gases and the like |
| US3826818A (en) * | 1972-08-03 | 1974-07-30 | Pennwalt Corp | Method for making anhydrous alkali metal hydrosulfites |
| US3933676A (en) * | 1974-04-08 | 1976-01-20 | Ventron Corporation | Stabilized aqueous solutions of sodium borohydride |
| DE2442418B2 (en) * | 1974-09-05 | 1980-04-17 | Basf Ag, 6700 Ludwigshafen | Process for the production of sodium dithionite |
| US4100098A (en) * | 1976-10-26 | 1978-07-11 | Olin Corporation | Stabilized solutions of sodium dithionite |
| US4148684A (en) * | 1976-11-08 | 1979-04-10 | Mei Systems Inc. | Methods for recovery and recycling of chemicals from sodium sulfite and sodium bisulfite pulping operations |
| EP0027369A1 (en) * | 1979-10-12 | 1981-04-22 | Thiokol Corporation | Stable precursor solution for the generation of hydrosulfite and use thereof in bleaching wood pulp, brightening kaolin clay and reducing vat dyestuffs to their leuco form |
| US4283303A (en) * | 1980-06-05 | 1981-08-11 | Virginia Chemicals Inc. | Process for manufacture of stable sodium dithionite slurries |
| US4379130A (en) * | 1981-09-21 | 1983-04-05 | Andersen 2000 Inc. | Process for regenerating scrubbing solutions |
| SE446720B (en) * | 1983-09-08 | 1986-10-06 | Stora Kopparbergs Bergslags Ab | Method for producing compositions used in sodium dithionite production and the use thereof |
| DE3427297C1 (en) * | 1984-07-24 | 1986-04-10 | GEA Wiegand GmbH, 7505 Ettlingen | Process for preparing a sodium dithionite solution |
-
1985
- 1985-05-07 US US06/731,296 patent/US4680136A/en not_active Expired - Lifetime
-
1986
- 1986-04-30 EP EP86850158A patent/EP0202210B1/en not_active Expired - Lifetime
- 1986-04-30 DE DE8686850158T patent/DE3669302D1/en not_active Expired - Lifetime
- 1986-04-30 AT AT86850158T patent/ATE50750T1/en not_active IP Right Cessation
- 1986-05-06 NO NO861801A patent/NO168699C/en not_active IP Right Cessation
- 1986-05-06 FI FI861881A patent/FI79826C/en not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| FI861881A (en) | 1986-11-08 |
| NO168699C (en) | 1992-03-25 |
| NO861801L (en) | 1986-11-10 |
| DE3669302D1 (en) | 1990-04-12 |
| FI79826C (en) | 1990-03-12 |
| EP0202210B1 (en) | 1990-03-07 |
| EP0202210A2 (en) | 1986-11-20 |
| US4680136A (en) | 1987-07-14 |
| EP0202210A3 (en) | 1987-08-12 |
| ATE50750T1 (en) | 1990-03-15 |
| FI79826B (en) | 1989-11-30 |
| FI861881A0 (en) | 1986-05-06 |
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